Fire resistant paper machine oils

ABSTRACT

A fire resistant paper machine oil comprising a blend of oil soluble base and water insoluble base having the formula: 0-100 wt % Oil Soluble PAG (Polyalkylene Glycol); 0-100 wt % Polyol Ester; an anti-wear additive; rust inhibitor; hindered phenolic anti-oxidant; alkylated di phenyl amine anti-oxidant; and, foam inhibitor. A blend of the base oils are the most preferred embodiment, however, a product could be formulated using only one type of base material such as an oil soluble base or a water insoluble base.

CROSS-REFERENCE TO RELATED CASES

This application claims the benefit of U.S. provisional patentapplication Ser. No. 63/392,831, filed on Jul. 27, 2022, andincorporates such provisional application fully by reference into thisdisclosure as if fully set out at this point.

FIELD OF THE INVENTION

The present invention relates, generally to oils used to lubricate highpressure paper machines, and more specifically to synthetic oils used inhigh pressure paper machines.

BACKGROUND OF THE INVENTION

In a paper mill, there are paper machines that utilize high pressurepaper machine oil. Current paper machine oils known in the art andavailable commercially are either mineral oil or Polyalphaolefin(hereinafter “PAO”) synthetics. In the event that a hose or piperuptures around an open flame or other hot surfaces, high pressure papermachine lubricant can ignite creating a major safety issue for plantoperation and personnel.

Mineral oil is made from highly refined, highly purified and highlyprocessed petroleum. Mineral oil is a clear, odorless liquid and acommon ingredient in a variety of cosmetics and personal care products.Mineral oil is also a lubricant used in many industrial applications. Assuch it is frequently used as a base oil in lubrication fluidformulations.

PAO oils are stable, lubricious fluids that are compatible with mostplastics and elastomers and are considered replacement for mineral oilsas they provide superior protection, greater thermal stability, andreduced volatility. PAO does not react with water. PAO is by far themost common major synthetic base oil used in industrial and automotivelubricants. PAO is a synthetic hydrocarbon (SEW) that mimics the besthydrocarbon (branched) structure found in mineral oils.

A need, therefore, exists for a high pressure paper machine oilformulation that is fire resistant.

SUMMARY OF THE INVENTION

The present invention relates to an anhydrous fire resistant papermachine oil. Using an anhydrous synthetic base material in a papermachine oil formulation that is more fire resistant than petroleum oilderivatives can be harder to ignite, as well as self-extinguishing inthe event the oil product does ignite once the flame source is removed,reducing the risk of fire spread. Using a fire resistant product canlower insurance rates, reduce need for fire suppression systems, andincrease plant safety.

The present disclosure relates to a fire resistant paper machine oilwith better performance than petroleum oil. The fire resistant papermachine oil of the present disclosure contemplates blends of polyol andpolyalkylene glycol (hereinafter “PAG”) from 100% polyol to 100% PAG.

An anhydrous fire resistant paper machine oil of the present disclosurepreferably consists of the following:

-   -   1. Polyalkylene Glycol (PAG), either water insoluble or oil        soluble, ranging from ISO 22 to ISO 320, comprising the final        formulation of 2-98%.    -   2. Polyol Ester, ranging from ISO 32 to 320, comprising the        final formulation of 2-98% (60-98% preferred).    -   3. Hindered Phenolic Anti-oxidant. Hindered phenolic        antioxidants function as free radical scavengers and provide        protection during high temperature processing operations and        also during end use at elevated temperatures.    -   4. High MW aromatic amine anti-oxidant, similar to PANA, APAN,        or diphenyl amine. May prevent degradation and maintain the        performance of the formulation and extend its useful life.    -   5. Ashless anti-wear additive, such as triaryl or trialkyl        phosphates.    -   6. Corrosion inhibitors, metallic dinonylnaphthalenesulfonate or        other salts of sulfonic acid, preferably barium or calcium, but        also zinc, containing a base number of 0 to 50.    -   7. Yellow metal corrosion inhibitor, such as        Benzotriazole-1-methanamine.    -   8. Silicon anti-foam, either silicon oil or siloxane.

The spray flammability characteristics of hydraulic fluids, and mineraloil, sprayed vertically upward in the open through a pressure-jet hollowcone nozzle and stabilized by a propane-air ring burner, have beenevaluated using the Factory Mutual Research Corporation (FMRC) FireProducts Collector. A spray flammability parameter (hereinafter “SEP”)is then defined, which combines the combustion intensity of spray firesin terns of chemical heat release rate with the fluid volatilitydescribed by the critical heat flux for ignition. An SFP value has beenidentified at or below which a range of hydraulic fluids cannot bestabilized as spray flames using a standard flame stabilization test.Mineral oil, some hydraulic fluids, and highly volatile fluids such asn-heptane, methanol and ethanol, have high SFP values and are easy tostabilize as spray flames. SEP has been determined to be useful indiscriminating between flammable and less flammable fluids and isgoverned by Factory Mutual Research Corporation FM 6930 (incorporatedherein by reference).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred formula embodiment includes a mixture of an oil solublebase and a water insoluble base material. In a preferred formulation,the most preferred oil soluble base is Polyalkylene Glycol (PAG) and themost preferred water insoluble base is Polyol Ester: All components ofthe formula of the present disclosure are available commercially fromvarious sources. It is understood that components bearing the same CASnumber from alternate commercial sources may be substituted.

Oil Soluble PAG (Polyalkylene Glycol) ISO 15-680 grades*, **73.03 wt %;*Depending on grade of paper machine, this will affect the viscosity ofthe blended PAG**The oil soluble PAG can be directly substituted withwater insoluble PAG, ranging from ISO 22 to ISO 320, blending to productgrade.

Polyol Ester, ISO 15-680, ISO 68 grade preferred 25.0 wt %; T-ButylPhenyl Phosphate Anti-Wear 0.4 wt %; Sulfonate, metallic salt, calcium,zinc, or barium, TBN 0.5 wt %; of 0-50 Hindered phenolic anti-oxidantCAS 125643-61-0 0.3 wt % Alkylated di phenyl amine anti-oxidant CAS68411-46-1 0.75 wt % Foam inhibitor, silicon 0.02 wt %.

Properties of the above formulation are as follows:

Paper Machine Oil FR 150 220 Viscosity @ 40 C., cSt 143 217 Viscosity @100 C., cSt 21.6 30.1 Viscosity Index 180 180 Specific Gravity 0.9670.971 Water Separation <3 mL @ 30 minutes <3 mL @ 30 minutes

A blend of the base oils are the most preferred embodiment, however, aproduct could be formulated using only one type of base material. Broadalternate preferred embodiment formulations using only one type of basematerial according to the present disclosure are as follows.

Alternate A. Oil Soluble Embodiment:

Oil Soluble PAG (Polyalkylene Glycol) ISO 15-680 98.03 wt % grades*, **T-Butyl Phenyl Phosphate and/or amine phosphate nti-Wear 0.4 wt %Sulfonate, metallic salt, calcium, zinc, or barium, TBN 0.5 wt % of 0-50Hindered phenolic anti-oxidant CAS 125643-61-0 0.3 wt % Alkylated diphenyl amine anti-oxidant CAS 68411-46-1 0.75 wt % Foam inhibitor,silicon 0.02 wt % *Depending on grade of paper machine, this will affectthe viscosity of the blended PAG ** The oil soluble PAG can be directlysubstituted with water insoluble PAG, ranging from ISO 22 to ISO 320,blending to product grade.

Alternate B. Water Insoluble Embodiment:

Polyol Ester, ISO 15-680, Blended to grade 98.03 wt % T-Butyl PhenylPhosphate and/or amine phosphate Anti- 0.4 wt % Wear Sulfonate, metallicsalt, calcium, zinc, or barium, TBN 0.5 wt % of 0-50 Hindered phenolicanti-oxidant CAS 125643-61-0 0.3 wt % Alkylated di phenyl amineanti-oxidant CAS 68411-46-1 0.75 wt % Foam inhibitor, silicon 0.02 wt %.The following table describes additional alternate embodimentformulations of the fire resistant paper machine oil of the presentdisclosure.

SFP can be estimated using the following parameters determined usingknown ASTM methods: 1.) Heat of Combustion; 2.) Fire Point; and 3.)Specific Gravity. The determined or estimated SFP for each alternateformulation is set forth in the tables below.

TABLE I-A Component A B C D E F G H I PAG - oil 34.0 34.5 34.5 34.85 X10.78 X X X soluble Dow UCON ™ OSP 32 PAG - oil 39.03 39.50 39.48 39.4839.03 35.63 10.0 15.0 X soluble Dow UCON ™ OSP 680 Polyol Ester 25.025.0 X 25.25 25.0 43.62 25.0 25.15 25.0 Zschimmer & Schwartz POE 68 HTanti-wear 0.4 0.25 0.25 X 0.4 0.4 0.4 X 0.4 additive SYN-O-AD 8485 rust0.5 0.25 0.25 X 0.5 0.5 0.5 0.1 0.5 inhibitor/anti- oxidant KingIndustries NASUL 729 anti-oxidant 0.3 X X X 0.3 0.3 0.3 X 0.3 PalmerHolland Naugalube NL 531 anti-oxidant 0.75 0.5 0.5 X 0.75 0.75 0.75 0.350.75 Palmer Holland Naugalube NL 750 silicon anti- 0.02 X 0.02 0.02 0.020.02 0.02 0.02 0.02 foam additive Munzing Foam Ban ® FB 149 antioxidantX X X 0.75 X X X 0.35 X PalmerHolland Nalube APAN anti-wear X X X 0.75 XX X 0.25 X additive PalmerHolland Nalube 6400 Polyol Ester X X 25.0 X XX X X X Zschimmer & Schwartz Lubricit PE 418-DF PAG water X X X X 34.0 XX X 25.0 insoluble Dow UCON ™ LB 165 Lubricant X X X X X X 17.15 12.448.03 Dow UCON ™ LN 1715 PAG water X X X X X X 45.88 4.36 X insolubleDow UCON ™ LB 625 yellow metal X X X X X X X 0.02 X corrosion inhibitorBASF Irgamet 39 Kinematic 145 144 143 144 142 151 155 158 148 ViscosityASTM D445 @ 40° C. + Specific .9642 .9652 .9462 .9652 .9802 .9752 .9932.9912 .9932 Gravity SFP 7.08 × 7.20 × 6.77 × 7.38 × 6.71 × 6.15 × 6.34 ×6.28 × 6.21 × 10⁴ 10⁴ 10⁴ 10⁴ 10⁴ 10⁴ 10⁴ 10⁴ 10⁴ + A viscosity goal of150 is desired. ++ X = None present.

TABLE I-B J K L M N O Mineral Oil 100 Reference Paper Machine Oil 220(ISO 220) PAG - oil X X X X X X soluble Dow UCON ™ OSP 680 Polyol EsterX 98.91 43.62 X X X Zschimmer & Schwartz POE 68 HT anti-wear X X X X X Xadditive SYN-O-AD 8485 rust 0.1 0.1 0.1 0.1 0.1 X inhibitor/anti-oxidant King Industries NASUL 729 anti-oxidant 0.35 0.35 0.35 0.35 0.35X Palmer Holland Naugalube NL 750 silicon anti- 0.02 0.02 0.02 0.02 0.02X foam additive Munzing Foam Ban ® FB 149 antioxidant 0.35 0.35 0.350.35 0.35 X PalmerHolland Nalube APAN anti-wear 0.25 0.25 0.25 0.25 0.25X additive PalmerHolland Nalube 6400 PAG water X X 11.61 X X X insolubleDow UCON ™ LB 165 PAG water 86.91 X X X 69.44 X insoluble Dow UCON ™ LB625 Lubricant 12.0 X 43.68 X 9.471 X Dow UCON ™ LN 1715 yellow metal0.02 0.02 0.02 0.02 0.02 X corrosion inhibitor BASF Irgamet 39 PAG -water X X X 98.91 20.0 X soluble Dow UCON ™ 50 HB 660 STM 0445 @ 13668.1 148 151 135 40° C. SG @ 15.6° C. 0.9972 0.9932 0.9942 1.0457 1.0068SFP 7.73 × 5.14 × 6.41 × 5.53 × 6.74 × 9.0 × 10⁴ 10⁴ 10⁴ 10⁴ 10⁴ 10⁴

TABLE II MOST PREFERRED EMBODIMENTS Component I (wt %) II (wt %) PolyolEster 84.0 68.0 Zschimmer & Schwartz POF HT 220 PAG - water insoluble7.91 X++ Dow UCON ™ LB 165 PAG - water insoluble 5.0 28.91 Dow UCON ™ LB625 PAG - oil soluble 2.0 2.0 Dow UCON ™ OSP 680 calcium sulfonate rust0.1 0.1 inhibitor King Industries NASUL 729 Diphenyl high temp. 0.350.35 antioxidant DPPH antioxidant 0.35 0.35 PalmerHolland Nalube APANanti-wear additive 0.25 0.25 PalmerHolland Nalube 6400 silicon anti-foamadditive 0.02 0.02 Munzing Foam Ban ® FB 149 yellow metal corrosion 0.020.02 inhibitor BASF Irgamet 39 Kinematic Viscosity 154 149 ASTM D445 @40° C.+ Specific Gravity @ 15° C. 0.974 0.98 SFP 4.96 × 10⁴ 5.10 × 10⁴

It is to be understood that the terms “including”, “comprising”,“consisting” and grammatical variants thereof do not preclude theaddition of one or more components, features, steps, or integers orgroups thereof and that the terms are to be construed as specifyingcomponents, features, steps or integers.

If the specification or claims refer to “an additional” element, thatdoes not preclude there being more than one of the additional element.

It is to be understood that where the claims or specification refer to“a” or “an” element, such reference is not be construed that there isonly one of that element.

It is to be understood that where the specification states that acomponent, feature, structure, or characteristic “may”, “might”, “can”or “could” be included, that particular component, feature, structure,or characteristic is not required to be included.

Where applicable, although state diagrams, flow diagrams or both may beused to describe embodiments, the invention is not limited to thosediagrams or to the corresponding descriptions. For example, flow neednot move through each illustrated box or state, or in exactly the sameorder as illustrated and described.

Methods of the present invention may be implemented by performing orcompleting manually, automatically, or a combination thereof, selectedsteps or tasks.

The term “method” may refer to manners, means, techniques and proceduresfor accomplishing a given task including, but not limited to, thosemanners, means, techniques and procedures either known to, or readilydeveloped from known manners, means, techniques and procedures bypractitioners of the art to which the invention belongs.

The term “at least” followed by a number is used herein to denote thestart of a range beginning with that number (which may be a range havingan upper limit or no upper limit, depending on the variable beingdefined). For example, “at least 1” means 1 or more than 1. The term “atmost” followed by a number is used herein to denote the end of a rangeending with that number (which may be a range having 1 or 0 as its lowerlimit, or a range having no lower limit, depending upon the variablebeing defined). For example, “at most 4” means 4 or less than 4, and “atmost 40%” means 40% or less than 40%.

When, in this document, a range is given as “(a first number) to (asecond number)” or “(a first number) — (a second number)”, this means arange whose lower limit is the first number and whose upper limit is thesecond number. For example, 25 to 100 should be interpreted to mean arange whose lower limit is 25 and whose upper limit is 100.Additionally, it should be noted that where a range is given, everypossible subrange or interval within that range is also specificallyintended unless the context indicates to the contrary. For example, ifthe specification indicates a range of 25 to 100 such range is alsointended to include subranges such as 26 -100, 27-100, etc., 25-99,25-98, etc., as well as any other possible combination of lower andupper values within the stated range, e.g., 33-47, 60-97, 41-45, 28-96,etc. Note that integer range values have been used in this paragraph forpurposes of illustration only and decimal and fractional values (e.g.,46.7-91.3) should also be understood to be intended as possible subrangeendpoints unless specifically excluded.

It should be noted that where reference is made herein to a methodcomprising two or more defined steps, the defined steps can be carriedout in any order or simultaneously (except where context excludes thatpossibility), and the method can also include one or more other stepswhich are carried out before any of the defined steps, between two ofthe defined steps, or after all of the defined steps (except wherecontext excludes that possibility).

Further, it should be noted that terms of approximation (e.g., “about”,“substantially”, “approximately”, etc.) are to be interpreted accordingto their ordinary and customary meanings as used in the associated artunless indicated otherwise herein. Absent a specific definition withinthis disclosure, and absent ordinary and customary usage in theassociated art, such terms should be interpreted to be plus or minus 10%of the base value.

Thus, the present invention is well adapted to carry out the objects andattain the ends and advantages mentioned above as well as those inherenttherein. While the inventive device has been described and illustratedherein by reference to certain preferred embodiments in relation to thedrawings attached thereto, various changes and further modifications,apart from those shown or suggested herein, may be made therein by thoseof ordinary skill in the art, without departing from the spirit of theinventive concept the scope of which is to be determined by thefollowing claims.

What is claimed is:
 1. A fire resistant paper machine oil comprising ablend of oil soluble base and water insoluble base.
 2. A fire resistantpaper machine oil, comprising: a base comprising oil solublePolyalkylene Glycol or Polyol Ester or a blend thereof; an anti-wearadditive; a rust inhibitor; an anti-oxidant; and; a foam inhibitor. 3.The fire resistant paper machine oil of claim 2 wherein said anti-wearadditive is selected from a group consisting of T-Butyl Phenyl Phosphateand amine phosphate or a mixture thereof
 4. The fire resistant papermachine oil of claim 2 wherein said rust inhibitor is selected from thegroup consisting of sulfonate, metallic salt, calcium, zinc, and barium.5. The fire resistant paper machine oil of claim 2 wherein saidanti-oxidant is an alkylated di phenyl amine.
 6. The fire resistantpaper machine oil of claim 2 wherein said foam inhibitor is siliconbased.
 7. A fire resistant paper machine oil, comprising Oil SolublePolyalkylene Glycol ISO 15-680 grades; Polyol Ester, 0.4 wt % T-ButylPhenyl Phosphate; 0.5 wt % rust inhibitor; 0.3 wt % Hindered phenolicanti-oxidant; 0.75 wt % Alkylated di phenyl amine anti-oxidant; 0.02 wt% Foam inhibitor.
 8. The fire resistant paper machine oil of claim 7wherein the oil soluble PAG is 0 wt %-100 wt %.
 9. The fire resistantpaper machine oil of claim 7 wherein said Polyol Ester is 0 wt %-100 wt%.
 10. The fire resistant paper machine oil of claim 7 wherein saidPolyol Ester is ISO 68 grade.
 11. The fire resistant paper machine oilof claim 7 wherein said rust inhibitor is selected from the groupconsisting of sulfonate, metallic salt, calcium, zinc, and barium. 12.The fire resistant paper machine oil of claim 7 wherein said rustinhibitor has a TBN of 0-50.
 13. The fire resistant paper machine oil ofclaim 7 wherein said Hindered phenolic anti-oxidant has a CAS125643-61-0.
 14. The fire resistant paper machine oil of claim 7 whereinsaid Alkylated di phenyl amine anti-oxidant has a CAS 68411-46-1. 15.The fire resistant paper machine oil of claim 7 wherein said foaminhibitor is silicon.